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Finding the Fourth Proportional to 947.63, 1,421.16 and 399.80

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Solution

The fourth proportional to 947.63, 1,421.16 and 399.80 is: 599.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.63 : 1,421.16 = 399.80 : x
  2. Step 2: Convert to fraction form
    947.63/1,421.16 = 399.80/x
  3. Step 3: Cross multiply
    947.63x = 1,421.16 × 399.80
  4. Step 4: Simplify right side
    947.63x = 568,172.66
  5. Step 5: Solve for x
    x = 568,172.66/947.63
  6. Step 6: Final answer
    x = 599.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.